JP6919879B2 - Optical output regulator, optical output adjustment method, and liquid crystal display - Google Patents

Description

The present invention relates to an optical output regulator for adjusting the light output of a light emitting source (light source), an optical output adjusting method, and a liquid crystal display device.

Various methods are known as methods for adjusting the light output of the light emitting source (light source).

A general method for adjusting the light output is a method in which the adjustment circuit provided in the light emitting source (light source) is directly operated to adjust the radiant intensity of the light emitting source (light source) to a desired amount of light. Hereinafter, this method will be referred to as a "direct adjustment method".

This direct adjustment method includes a method of manually operating the adjustment circuit without giving feedback to adjust the amount of light (hereinafter referred to as "direct manual adjustment method") and a method of adjusting the amount of light by giving feedback (hereinafter, referred to as "direct manual adjustment method"). Hereinafter, it is divided into "direct feedback adjustment method"). In this direct feedback adjustment method, the amount of light emitted from the light emitting source (light source) is detected, and the adjustment circuit is controlled based on the detected amount of light to reduce the radiant intensity of the light emitting source (light source) to a desired amount of light. adjust.

The light emitting source (light source) includes a light emitting source having a slow response speed (a light emitting source having poor followability). It is assumed that such a light emitting source (light source) having a slow response speed is used to gradually increase or decrease the amount of light for adjustment. In this case, the direct manual adjustment method has a problem that it is necessary to provide a stable time for each stage. On the other hand, even with the direct feedback adjustment method, there is a problem that the adjustment time takes time.

Further, in the direct adjustment method, the resolution per step in which the amount of light can be adjusted is limited by the configuration of the adjustment circuit. Therefore, when it is desired to finely adjust the amount of light or when finer adjustment of the amount of light is required, it is necessary to adopt a high-performance component having a high-resolution function as a component of the adjustment circuit. Therefore, the device becomes expensive.

In order to eliminate the drawbacks of this direct adjustment method, a method of not adjusting the radiant intensity of the light emitting source (light source) itself has been proposed. For example, a transmission amount adjusting panel capable of adjusting the transmission amount of the light is interposed on the optical path of the light radiated from the light emitting source (light source), and the light amount of the light transmitted from the transmission amount adjustment panel is the desired light amount. There is a known method of adjusting to. Hereinafter, this method will be referred to as an "intervening adjustment method". This intervention adjustment method is also divided into an intervention manual adjustment method and an intervention feedback adjustment method.

This intervention adjustment method is disclosed in, for example, Patent Document 1. Patent Document 1 discloses a "lighting control device" that can adjust the amount of light with a simple configuration without being affected by the characteristics of a light source. Patent Document 1 discloses a lighting control device that realizes an intervening manual adjustment method as a first embodiment, and discloses a lighting control device that realizes an intervening feedback adjustment method as a second embodiment. The illumination control device that realizes the intervening feedback adjustment method according to the second embodiment includes a light source, a condenser lens, an irradiation surface, a transmissive liquid crystal panel, a pattern generator, a two-dimensional optical sensor, and a control unit. ..

The light source and the condenser lens constitute an optical system that forms parallel light having a predetermined optical path (optical axis). The transmissive liquid crystal panel is a well-known liquid crystal panel having pixels (Px, Py) in a two-dimensional array, and is arranged on an optical path so that parallel light is transmitted. The pattern generator constitutes a pattern generating means for generating a pattern setting signal for designating pixels of a transmissive liquid crystal panel and setting a display density (light-shielding pattern). In such a configuration, a predetermined light-shielding pattern is displayed on the transmissive liquid crystal panel, and the irradiation state on the irradiation surface is determined by the parallel light transmitted through the transmissive liquid crystal panel. Therefore, the irradiation state can be arbitrarily set by controlling the pattern setting signal.

The two-dimensional optical sensor constitutes a photodetector having two-dimensional array of pixels (Tx, Ty) like a CCD camera, is arranged on the optical axis (optical axis) of parallel light, and irradiates the irradiation surface. The illuminance distribution of the luminous flux is detected for each pixel. It is suitable that the pixel size of the transmissive liquid crystal panel is larger than or equal to the pixel size (size on the photographing surface) of the two-dimensional optical sensor. The control unit constitutes a control means for controlling the pattern generator so as to generate a pattern setting signal that sets a predetermined shading pattern based on the detection result from the two-dimensional optical sensor. That is, the pattern generator takes in the illuminance distribution of the irradiation surface detected by the two-dimensional optical sensor, calculates the difference from the preset irradiation information, and uses the display correction amount of the light-shielding pattern in the transmissive liquid crystal panel as a control signal. Output to.

Further, as a technique related to the present invention, Patent Document 2 discloses a "projection type display device" capable of improving contrast satisfactorily. The projection type display device disclosed in Patent Document 2 includes a lamp device, a main liquid crystal panel, a sub liquid crystal panel, and a control circuit unit for controlling them. A drive signal based on the brightness of the image formed on the main liquid crystal panel is input to the sub liquid crystal panel. The sub liquid crystal panel modulates the incident light based on the input drive signal. As a result, the light whose amount of light is modulated in pixel units is emitted from the sub liquid crystal panel. The control circuit unit includes a video signal processing circuit and a sub liquid crystal panel drive circuit. The video signal processing circuit holds a table in which the transmittance of each pixel of the sub-liquid crystal panel with respect to the average brightness of the irradiation region is set. The transmittance of each pixel is set so that the higher the average brightness of the irradiation region, the higher the transmittance. The video signal processing circuit determines the transmittance of each pixel from the obtained average brightness using a table, generates a drive signal so that the transmittance of each pixel becomes the determined transmittance, and generates a sub-liquid crystal panel. Output to the drive circuit.

Further, Patent Document 3 discloses a "liquid crystal display device" capable of switching between a reflective monotone display and a transmissive color display. The liquid crystal display device disclosed in Patent Document 3 includes a liquid crystal panel and a backlight, and has a dimmer for adjusting the amount of light output by the backlight. That is, in the liquid crystal display device disclosed in Patent Document 3, a dimmer is used to directly adjust the amount of light of the backlight.

Japanese Unexamined Patent Publication No. 11-053923 Japanese Unexamined Patent Publication No. 2011-227348 Japanese Unexamined Patent Publication No. 2007-183511

However, Patent Document 1, Patent Document 2, and Patent Document 3 each have the following problems.

In Patent Document 1, the two-dimensional optical sensor detects the illuminance distribution of the luminous flux irradiated on the irradiation surface for each pixel, and the pattern generator generates a pattern setting signal for designating the pixels of the transmissive liquid crystal panel. That is, in Patent Document 1, since the amount of light is controlled (adjusted) for each pixel, there is a problem that the correction process becomes complicated.

Also in Patent Document 2, the amount of light is modulated in pixel units with respect to the sub liquid crystal panel. Therefore, Patent Document 2 also has a problem that the process for controlling the sub liquid crystal panel becomes complicated.

Further, in Patent Document 3, since a "direct adjustment method" for directly adjusting the amount of light of the backlight by using a dimmer is adopted, there is a problem in the above-mentioned "direct adjustment method".

An object of the present invention is to provide an optical output regulator, an optical output adjusting method, and a liquid crystal display device that solve the above-mentioned problems.

The light output adjuster of the present invention includes a surface light emitting means that emits surface light, a transmission amount adjusting panel that is arranged on the light path of the surface light emission and can adjust the transmission amount, and a transmission that has passed through the transmission amount adjustment panel. An optical output regulator including a control unit that detects light and controls the transmission amount adjustment panel based on the detection result, and each of the transmission amount adjustment panels has a display size larger than the pixel size. It is divided into display areas of the first to M (M is an integer of 2 or more) to have, and the divided transmitted light of the first to M is transmitted from the first to M display areas, respectively, and the control unit. Is based on the first to M light receiving units that receive the first to M divided transmitted light as the first to M detection signals, respectively, and the first to M detection signals. It has a control signal generation unit that generates first to M control signals for independently controlling the transmission amount of the first to M display areas to different amounts.

The light output adjusting method of the present invention is an optical adjustment of an optical output regulator including a surface emitting means for performing surface emission and a transmission amount adjusting panel arranged on the surface emitting optical path and capable of adjusting the transmitted amount. In the method, the transmission amount adjustment panel is divided into first to M (M is an integer of 2 or more) display areas, each of which has a display size larger than the pixel size, and the first to M. The first to M divided transmitted light is transmitted from the display area of the above, and the first to M divided transmitted light is received as the first to M detection signals, respectively, and the first to M detection is performed. Based on the signal, the first to M control signals for independently controlling the transmission amount of the first to M display areas to different amounts are generated.

The liquid crystal display device of the present invention comprises a backlight, a display liquid crystal panel, a transmission amount adjusting liquid crystal panel inserted between the backlight and the display liquid crystal panel, and the transmission amount adjusting liquid crystal panel. A liquid crystal display device including a control unit for controlling the amount of transmission, wherein each of the display liquid crystal panels has a screen size larger than the pixel size of the first to N (N is an integer of 2 or more). The liquid crystal panel for adjusting the transmission amount is divided into display screens, and each of the transmission amount adjusting liquid crystal panels is divided into first to Nth adjustment areas according to the screen size of the first to Nth display screens. The control unit individually adjusts the permeation amount of the first to Nth adjustment areas to different amounts .

According to the present invention, it is possible to provide an optical output adjuster, an optical output adjusting method, and a liquid crystal display device, which have a simple correction process.

It is an appearance and block diagram which shows the schematic structure of the optical output regulator which concerns on 1st related art. It is a figure which shows the display pattern example of the transmission amount adjustment panel (transmission type liquid crystal panel) used for the light output adjuster shown in FIG. It is an appearance and a block diagram which shows the schematic structure of the optical output regulator (optical sensor) which concerns on the 2nd related technique. It is a figure which shows the display pattern example of the transmission amount adjustment panel (transmission type liquid crystal panel) used for the optical output regulator (optical sensor) shown in FIG. It is an appearance and block diagram which shows the schematic structure of the optical output regulator (optical sensor) which concerns on 1st Embodiment of this invention. It is a figure which shows the example of the display pattern displayed on the transmission amount adjustment panel (transmission type liquid crystal panel) used for the optical output regulator (optical sensor) shown in FIG. It is an appearance and block diagram which shows the schematic structure of the liquid crystal display device (liquid crystal monitor) which concerns on 2nd Embodiment of this invention. It is a figure which shows the example of the display pattern displayed on the liquid crystal panel for adjusting the transmission amount used in the liquid crystal display device (liquid crystal monitor) shown in FIG. 7.

In order to facilitate the understanding of the present invention, related techniques will be described.

[Related Technology 1]
The optical output regulator 10 according to the first related technique will be described with reference to FIGS. 1 and 2. The optical output regulator 10 is a device substantially corresponding to the first embodiment of Patent Document 1, and is a device that realizes an intervening manual adjustment method.

FIG. 1 is an external view and a block diagram showing a schematic configuration of the optical output regulator 10.

The illustrated optical output regulator 10 includes a light emitting source 11, a transmission amount adjusting panel 12, and a control LSI (large scale integrated circuit) 13.

The light emitting source 11 emits a certain amount of synchrotron radiation. A transmission amount adjusting panel 12 is arranged on the optical path of the synchrotron radiation of the light emitting source 11. The control LSI 13 adjusts the amount of transmitted light transmitted through the transmission amount adjustment panel 12 by varying the transmission amount of the transmission amount adjustment panel 12.

By keeping the amount of synchrotron radiation emitted from the light emitting source 11 constant without changing it, it is possible to eliminate the need to consider the limitation of the response speed due to the light emitting source 11.

Further, as the transmission amount adjusting panel 12, it is preferable to use a transmission type liquid crystal panel as disclosed in Patent Document 1.

FIG. 2 is a diagram showing an example of a display pattern displayed on the transmissive liquid crystal panel 12. In FIG. 2, (A) shows an example of a display pattern when the transmission amount of the transmissive liquid crystal panel 12 is 50%, and (B) is a display pattern when the transmission amount of the transmissive liquid crystal panel 12 is 66%. An example is shown, and (C) shows an example of a display pattern when the transmission amount of the transmissive liquid crystal panel 12 is 75%.

As shown in FIG. 2, the transmission amount of the transmissive liquid crystal panel 12 can be easily adjusted from the display pattern displayed on the transmissive liquid crystal panel 12. Further, since the response speed of the optical output regulator 10 is dominated by the response speed of the display switching of the transmissive liquid crystal panel 12, it is expected to be faster.

However, this first related technique is merely a technique for adjusting the amount of transmitted light by adjusting the total amount of transmitted light of the transmitted amount adjusting panel (transmissive liquid crystal panel) 12.

[Related Technology 2]
The optical output regulator 20 according to the second related technique will be described with reference to FIGS. 3 and 4. The optical output regulator 20 is a device substantially corresponding to the second embodiment of Patent Document 1, and is a device that realizes an intervening feedback adjusting method.

FIG. 3 is an external view and a block diagram showing a schematic configuration of the optical output regulator 20.

The illustrated optical output regulator 20 includes a light emitting source 21, a transmission amount adjusting panel 22, a light receiving unit 23, a current / voltage conversion unit 24, an A / D conversion unit 25, and a control LSI 26. The combination of the light emitting source 21 and the transmission amount adjusting panel 22 acts as a light emitting unit (21, 22).

However, unlike the lighting control device of the second embodiment of Patent Document 1, the light output regulator 20 is composed of a light emitting unit (21,22) and a light receiving unit 23 to form an optical sensor.

The transmission amount adjusting panel 22 is inserted in the optical path of the optical sensor. Therefore, the space between the transmission amount adjusting panel 22 and the light receiving unit 23 serves as a detection area for detecting the detected object.

The current / voltage conversion unit 24 converts the optical current, which is the sensor output (detection signal) from the light receiving unit 23, into a voltage value at the analog signal level. The A / D converter 25 converts the voltage value of the analog signal level into a multi-valued digital signal. Therefore, the combination of the current / voltage conversion unit 24 and the A / D conversion unit 25 acts as an A / D conversion means for converting the sensor output (detection signal) from the light receiving unit 23 into a digital signal.

The control LSI 26 controls the entire optical output regulator (optical sensor) 20. Specifically, the control LSI 26 refers to the input digital signal and arbitrarily sets the transmission amount of the transmission amount adjusting panel 22 so that the sensor output (detection signal) becomes a desired value. As a result, the amount of transmitted light (incident light) transmitted through the transmission amount adjusting panel 22 and incident on the light receiving unit 23 can be adjusted to a desired value.

The combination of the light receiving unit 23, the current / voltage conversion unit 24, the A / D conversion unit 25, and the control LSI 26 detects the transmitted light transmitted through the transmission amount adjustment panel 22 and sets the transmission amount adjustment panel based on the detection result. It works as a control unit to control.

Further, the combination of the current / voltage conversion unit 24, the A / D conversion unit 25, and the control LSI 26 generates a control signal that generates a control signal for controlling the transmission amount of the transmission amount adjustment panel 22 based on the detection signal. It is called a department.

Further, as in the first related technique, it is preferable to use a transmissive liquid crystal panel as disclosed in Patent Document 1 as the transmission amount adjusting panel 22.

FIG. 4 is a diagram showing an example of a display pattern displayed on the transmissive liquid crystal panel 22. In FIG. 4, (A) shows an example of a display pattern when the transmission amount of the transmissive liquid crystal panel 22 is 50%, and (B) is a display pattern when the transmission amount of the transmissive liquid crystal panel 22 is 66%. An example is shown, and (C) shows an example of a display pattern when the transmission amount of the transmissive liquid crystal panel 22 is 75%.

As shown in FIG. 4, the transmission amount of the transmissive liquid crystal panel 22 can be easily adjusted from the display pattern displayed on the transmissive liquid crystal panel 22.

However, this second related technique is also merely a technique for adjusting the amount of transmitted light (incident light) by adjusting the total amount of transmitted light of the transmitted amount adjusting panel (transmissive liquid crystal panel) 22.

As described above, in the lighting control device according to the second embodiment of Patent Document 1, a two-dimensional optical sensor is used as the light receiving unit 23. Then, the two-dimensional optical sensor detects the illuminance distribution of the luminous flux irradiated on the irradiation surface for each pixel, and the pattern generator generates a pattern setting signal for designating the pixels of the transmissive liquid crystal panel. Therefore, as described above, in Patent Document 1, since the amount of light is controlled (adjusted) for each pixel, there is a problem that the correction process becomes complicated.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Embodiment 1]
The optical output regulator 30 according to the first embodiment of the present invention will be described with reference to FIGS. 5 and 6. The optical output regulator 30 is a device that realizes an intervening feedback adjusting method.

FIG. 5 is an external view and a block diagram showing a schematic configuration of the optical output regulator 30.

The illustrated light output regulator 30 includes a light emitting source 31, a light diffusing panel 32, a transmission amount adjusting panel 33, first and second light guide means 34a and 34b, and first and second light receiving units 35a. , 35b, a current / voltage conversion unit 36, an A / D conversion unit 37, and a control LSI 38.

The combination of the light emitting source 31, the light diffusing panel 32, and the transmission amount adjusting panel 33 acts as a light emitting unit (31, 32, 33). The first and second light receiving units 35a and 35b are collectively referred to as light receiving units (35a and 35b). Therefore, the illustrated optical output regulator 30 functions as an optical sensor including a light emitting unit (31, 32, 33) and a light receiving unit (35a, 35b).

The light emitting source 31 emits synchrotron radiation. The light diffusion panel 32 converts synchrotron radiation into surface emission. Therefore, the combination of the light emitting unit (light emitting source) 31 and the light diffusion panel 32 operates as a surface light emitting means for performing surface light emission.

The transmission amount adjusting panel 33 is arranged on the surface-emitting light, and the transmission amount can be adjusted as described later.

The transmission amount adjusting panel 33 is divided into first to M (M is an integer of 2 or more) display areas, each of which has a display size larger than the pixel size. Then, the transmission amount adjusting panel 33 transmits the first to M divided transmitted light from the first to M display areas, respectively.

In this example, the integer M is equal to 2. Therefore, the illustrated transmission amount adjusting panel 33 is divided into the first and second display areas, and the first and second divided transmitted lights are transmitted from the first and second display areas, respectively.

The first and second light guide means 34a and 34b lead the first and second divided transmitted light toward the first and second light receiving units 35a and 35b, respectively. Therefore, the first and second divided transmitted lights are distributed to the first and second light receiving units 35a and 35b by the first and second light guide means 34a and 34b, respectively.

The first space between the exit end of the first light guide means 34a and the first light receiving unit 35a serves as a first detection area for detecting a detected object. Similarly, the second space between the exit end of the second light guide means 34b and the second light receiving unit 35b serves as a second detection area for detecting the detected object.

The first and second light receiving units 35a and 35b receive (detect) the first and second divided transmitted light as the first and second sensor outputs (first and second detection signals), respectively. ..

The current / voltage converter 36 converts the photocurrents, which are the first and second sensor outputs (first and second detection signals), into voltage values of the first and second analog signal levels, respectively. The A / D converter 37 converts the voltage values of the first and second analog signal levels into the multi-valued first and second digital signals, respectively. Therefore, the combination of the current / voltage conversion unit 36 and the A / D conversion unit 37 is a combination of the first and second sensor outputs (first and second detection signals) from the first and second light receiving units 35a and 35b. ) Acts as A / D conversion means for converting the first and second digital signals, respectively.

The control LSI 38 controls the entire optical output regulator (optical sensor) 30. Specifically, the control LSI 38 refers to the input first and second digital signals, and the first and second sensor outputs (first and second detection signals) have different desired values, respectively. Therefore, the first and second control signals for independently controlling the transmission amount of the first and second display areas of the transmission amount adjustment panel 33 to different amounts are generated. That is, the control LSI 38 acts as a control circuit that generates first and second control signals based on the first and second digital signals, respectively.

With such a configuration, the first and second divided transmitted light (first and second incident light) transmitted through the transmission amount adjusting panel 33 and incident on the first and second light receiving portions 35a and 35b. The amount of light can be independently adjusted to a different desired value.

The combination of the first and second light receiving units 35a and 35b, the current / voltage conversion unit 36, the A / D conversion unit 37, and the control LSI 38 detects the transmitted light transmitted through the transmission amount adjusting panel 33, and the detection result is It works as a control unit that controls the transmission amount adjusting panel 33 based on the above.

Further, the combination of the current / voltage conversion unit 36, the A / D conversion unit 37, and the control LSI 38 is based on the first and second detection signals in the first and second display areas of the transmission amount adjusting panel 33. It is called a control signal generation unit that generates first and second control signals for independently controlling the amount of transmission to different amounts.

Similar to the second related technique, in the illustrated example, a transmissive liquid crystal panel is used as the transmission amount adjusting panel 33.

FIG. 6 is a diagram showing an example of a display pattern displayed on the transmissive liquid crystal panel 33.

As shown in FIG. 6, the transmissive liquid crystal panel 33 is divided into first and second display areas, each of which is rectangular and has the same area. In FIG. 6, the first display area is described as “display area a” and the second display area is described as “display area b”.

FIG. 6 shows an example of a display pattern when the transmission amount of the first display area “display area a” is 50% and the transmission amount of the second display area “display area b” is 75%. Shown.

As shown in FIG. 6, the display area of the transmissive liquid crystal panel 33 is divided into the first and second display areas in order to adjust the transmission amount of the first and second light receiving portions 35a and 35b, respectively. By displaying the pattern, it is possible to independently adjust the amount of transmission to different amounts.

Further, according to the above configuration and method, the circuits and constituent members of the light emitting unit (31, 32, 33) can be integrated into one, so that an increase in the number of parts can be suppressed. In other words, in the main optical sensor 30, it is not necessary to provide a plurality of each of the light emitting source, the light diffusing panel, and the transmission amount adjusting panel.

Further, in the first embodiment, since the transmissive liquid crystal panel 33 controls (adjusts) the amount of light not for each pixel but for each display area, the correction process is simplified.

In the first embodiment, the transmission amount adjustment panel 33 is divided into the first and second display areas, but as described above, generally, the first to M display areas are used. It may be divided. Further, in the first embodiment, each display area has a rectangular shape and has the same area, but is not limited thereto. For example, the transmission amount adjustment panel 33 is composed of two display areas, one display area has a rectangular shape provided in the central portion, and the other display area has a ring shape (doughnut) provided in the peripheral portion. Shape) may be used.

Further, in the first embodiment, the optical output regulator (optical sensor) 30 includes the first and second light guide means 34a and 34b, but these may be omitted.

[Embodiment 2]
The liquid crystal display device (liquid crystal monitor) 40 according to the second embodiment of the present invention will be described with reference to FIGS. 7 and 8. The liquid crystal display device (liquid crystal monitor) 40 is a device that directly realizes a manual adjustment method and adjusts the output of the backlight.

FIG. 7 is an external view and a block diagram showing a schematic configuration of the liquid crystal display device (liquid crystal monitor) 40.

The illustrated liquid crystal display device (liquid crystal monitor) 40 includes a light emitting source 41, a display liquid crystal panel 42, a transmission amount adjusting liquid crystal panel 43, a light diffusion panel 44, and a control LSI 45.

The light emitting source 41 emits synchrotron radiation. The light diffusion panel 44 converts synchrotron radiation into surface emission. Therefore, the combination of the light emitting source 41 and the light diffusing panel 44 operates as a backlight (41, 44).

The transmission amount adjusting liquid crystal panel 43 is arranged between the backlight (41, 44) and the display liquid crystal panel 42.

As will be described later, the control LSI 45 operates as a control unit that controls the transmission amount of the transmission amount adjusting liquid crystal panel 43.

The display liquid crystal panel 42 is divided into first to Nth (N is an integer of 2 or more) display screens, each of which has a screen size larger than the pixel size. The transmission amount adjusting liquid crystal panel 43 is divided into first to Nth adjustment areas according to the screen size of the first to Nth display screens, respectively. The control LSI 45 individually adjusts the transmission amount of the first to Nth adjustment areas of the transmission amount adjusting liquid crystal panel 43 to different amounts from each other .

In this example, the integer N is equal to 4. Therefore, the illustrated display liquid crystal panel 42 is divided into first to fourth display screens for multi-screen display. In FIG. 7, the first to fourth display screens are described by "display A", "display B", "display C", and "display D", respectively.

FIG. 8 is a diagram showing an example of a display pattern displayed on the transmission amount adjusting liquid crystal panel 43.

As shown in FIG. 8, each of the transmission amount adjusting liquid crystal panels 43 is rectangular and is divided into first to fourth adjustment areas having the same area. In FIG. 8, the first adjustment area is described as “display A”, the second adjustment area is described as “display B”, the third adjustment area is described as “display C”, and the fourth adjustment is described. The area is described as "display D".

In FIG. 8, the transmission amount of the first adjustment area “display A” is 50%, the transmission amount of the second adjustment area “display B” is 75%, and the transmission amount of the third adjustment area “display C” is 75%. An example of a display pattern is shown when the transmission amount is 100% and the transmission amount of the fourth adjustment area “display C” is 25%.

As described above, in the second embodiment, the display screen of the display liquid crystal panel 42 is divided into arbitrary sizes / shapes, and the transmission amount of each adjustment area of the transmission amount adjustment liquid crystal panel 43 is individually different from each other. in the adjustment child on the amount, it is possible and this to adjust the luminance.

In the case of multi-screen display, the transmission amount adjusting liquid crystal panel 43 is divided into adjustment areas according to the screen size of each display screen of the display liquid crystal panel 42. As shown in FIG. 8, the control LSI 45 controls each adjustment area so as to be displayed in an arbitrary dot density pattern. This makes it possible to individually adjust the brightness of each display screen of the display liquid crystal panel 42 to different brightness.

Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the structure and details of the present invention within the scope of the present invention.

The present invention can be used in analog circuits of industrial equipment having a function of adjusting the amount of light and adjusting an optical sensor.

30 Optical output regulator (optical sensor)
31 Light emitting source 32 Light diffusion panel 33 Transmission amount adjustment panel 34a First light guide means 34b Second light guide means 35a First light receiving part 35b Second light receiving part 36 Current / voltage conversion unit 37 A / D conversion unit 38 Control LSI
40 Liquid crystal display device (liquid crystal monitor)
41 Light emitting source 42 Liquid crystal panel for display 43 Liquid crystal panel for adjusting the amount of transmission 44 Light diffusion panel 45 Control LSI (control unit)

Claims (8)

Surface emitting means for surface emission and
A transmission amount adjustment panel arranged on the surface-emitting light path and capable of adjusting the transmission amount,
A control unit that detects the transmitted light transmitted through the transmission amount adjustment panel and controls the transmission amount adjustment panel based on the detection result.
It is an optical output regulator equipped with
The transmission amount adjustment panel is divided into first to M (M is an integer of 2 or more) display areas each having a display size larger than the pixel size, and from the first to M display areas. Each of the first to M divided transmitted light is transmitted,
The control unit
The first to M light receiving units that receive the first to M divided transmitted light as the first to M detection signals, respectively.
A control signal that generates first to M control signals for independently controlling the transmission amount of the first to M display areas to different amounts based on the first to M detection signals. The generator and
Has an optical output regulator. The first to M light guide means for leading the first to M divided transmitted light toward the first to M light receiving portions, respectively, is provided.
The optical output regulator according to claim 1. The surface emitting means is
A light emitting source that emits synchrotron radiation,
A light diffusion panel that converts the synchrotron radiation into the surface emission,
The optical output regulator according to claim 1 or 2. The control signal generator
An A / D conversion means for converting the first to M detection signals into first to M digital signals, respectively.
A control circuit that generates the first to Mth control signals based on the first to Mth digital signals, respectively.
The optical output regulator according to any one of claims 1 to 3. The optical output regulator according to claim 4, wherein the control circuit generates the first to M control signals so that the first to M detection signals have different desired values. A light adjusting method for an optical output regulator comprising a surface emitting means for performing surface emission and a transmission amount adjusting panel arranged on the surface emitting optical path and capable of adjusting the transmitted amount.
The transmission amount adjustment panel is divided into first to M (M is an integer of 2 or more) display areas, each of which has a display size larger than the pixel size, and each of the first to M display areas is used. The first to Mth divided transmitted light is transmitted,
The first to M first divided transmitted light is received as the first to M detection signals, respectively, and the light is received.
Based on the first to M detection signals, the first to M control signals for independently controlling the transmission amount of the first to M display areas to different amounts are generated.
Optical output adjustment method. Backlight and
LCD panel for display and
A liquid crystal panel for adjusting the amount of transmission inserted between the backlight and the liquid crystal panel for display,
A control unit that controls the transmission amount of the liquid crystal panel for adjusting the transmission amount,
It is a liquid crystal display device equipped with
The display liquid crystal panel is divided into first to Nth (N is an integer of 2 or more) display screens, each of which has a screen size larger than the pixel size.
The transmission amount adjusting liquid crystal panel is divided into first to Nth adjustment areas according to the screen size of the first to Nth display screens, respectively.
The control unit individually adjusts the permeation amount of the first to Nth adjustment areas to different amounts .
Liquid crystal display device. The liquid crystal display device according to claim 7, wherein the control unit controls the first to Nth adjustment areas so as to display them in a dot density pattern.

Images